Section

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Related to sections: thesaurus, Conic sections, Steel sections

section

1. Transport the section of a railway track that is maintained by a single crew or is controlled by a particular signal box
2. Archit a representation of a portion of a building or object exposed when cut by an imaginary vertical plane so as to show its construction and interior
3. Geometry
a. a plane surface formed by cutting through a solid
b. the shape or area of such a plane surface
4. Surgery any procedure involving the cutting or division of an organ, structure, or part, such as a Caesarian section
5. a thin slice of biological tissue, mineral, etc., prepared for examination by a microscope
6. a segment of an orange or other citrus fruit
7. Austral and NZ a fare stage on a bus, tram, etc.
8. Music
a. an extended division of a composition or movement that forms a coherent part of the structure
b. a division in an orchestra, band, etc., containing instruments belonging to the same class

section

1. An orthographic projection of an object or structure as it will appear if cut through by an intersecting plane to expose its internal configuration.
See also: Projection drawing
2. The representation of a building or portion thereof, cut vertically at some imagined plane, so as to show the interior of the space or the profile of the member. See also Projection drawing.

Section

 

in architecture, the frontal projection of a building or an architectural detail that is arbitrarily cut by a plane or a system of planes. The configuration of architectural details, volumes, or interior spaces can be symbolized by a section drawing. A section also characterizes the form and configuration of a structure.


Section

 

in botany, a taxonomic category intermediate between a subgenus and a series. The name of a section is designated by a noun. A section that includes the type species of a given subgenus has the same name as the subgenus. For example, in the genus Carex (sedge) the designation Vignea is used for both the subgenus and the section that includes the type species of the subgenus (Carex arenaria). Thus, the name used to indicate the section to which the species belongs is Carex (sect. Vignea) arenaria.


Section

 

(1) A division or subdivision of an organization or institution.

(2) A group of delegates chosen to work on a set of questions at congresses or meetings.


Section

 

in geology, a thin, flat piece of rock, mineral, or fossil coal used in microscopic studies. The most commonly used sections are thin sections—flat pieces 0.02–0.03 mm in thickness prepared mainly from silicate rocks. At such a thickness, most minerals are translucent, which makes it possible to study them with a polarizing microscope to determine the optical properties of the minerals, the crystal structure, the nature of interrelationships, and other aspects of minerals. The study of thin sections is one of the primary techniques of petrography. Sections 0.005–0.035 mm in thickness are used to study fossil coals. Sections are made by grinding one side of a fragment of rock or mineral of any thickness on a special grinding machine, cementing the polished side to a glass slide with Canadian balsam or some other organic resin, and then grinding the other surface until the section reaches the proper thickness.

Polished translucent sections, in which the upper surface of the section is polished with special care, are made to study the composition of minerals by spectral X-ray analysis. For opaque minerals, mostly ores, polished sections are used, which are usually 0.5–1.0 cm in thickness, polished on one side, and mounted on a glass slide with mastic or modeling clay. The study of polished sections of ore minerals is the task of mineragraphy, or mineralo-graphy, an important branch of mineralogy.

A. M. BORSUK

section

[′sek·shən]
(civil engineering)
A piece of land usually 1 mile square (640 acres or approximately 2.58999 square kilometers) with boundaries conforming to meridians and parallels within established limits; 1 of 36 units of subdivision of a township in the U.S. Public Land survey system.
(communications)
Each individual transmission span in a radio relay system; a system has one more section than it has repeaters.
(geology)
An inclined or vertical surface that is uncovered either naturally (as a sea cliff or stream bank) or artificially (as a strip mine or road cut) through a part of the earth's crust.
A description or scale drawing of the successive rock units or geologic structures shown by the exposed surface, or their appearance if cut through by any intersecting plane.
(mathematics)
For a polyhedral angle, the polygon formed by the intersection of the faces of the angle with a plane that does not pass through the vertex.
References in classic literature ?
That there are persons in one section or another who seek to destroy the Union at all events, and are glad of any pretext to do it, I will neither affirm nor deny; but if there be such, I need address no word to them.
These good ladies were perfectly ignorant, it seems, of the customs of the South, and in the goodness of their hearts insisted that I take a seat with them in their section.
Seal brought sandwiches, which she ate beneath the plane-trees in Russell Square; while Mary generally went to a gaudy establishment, upholstered in red plush, near by, where, much to the vegetarian's disapproval, you could buy steak, two inches thick, or a roast section of fowl, swimming in a pewter dish.
The Doctor still read from cover to cover his Lancet and his Medical Journal, attended all professional gatherings, worked himself into an alternate state of exaltation and depression over the results of the election of officers, and reserved for himself a den of his own, in which before rows of little round bottles full of glycerine, Canadian balsam, and staining agents, he still cut sections with a microtome, and peeped through his long, brass, old-fashioned microscope at the arcana of nature.
The wreckage of the spring washing appeared everywhere--piles of sluice-boxes, sections of elevated flumes, huge water-wheels,--all the debris of an army of gold-mad men.
The Works and Days": The poem consists of four main sections.
I believe that the arrangement of the groups within each class, in due subordination and relation to the other groups, must be strictly genealogical in order to be natural; but that the amount of difference in the several branches or groups, though allied in the same degree in blood to their common progenitor, may differ greatly, being due to the different degrees of modification which they have undergone; and this is expressed by the forms being ranked under different genera, families, sections, or orders.
It will be perceived more clearly by inspecting the following sections which are real ones, taken in north and south lines, through the islands with their barrier-reefs, of Vanikoro, Gambier, and Maurua; and they are laid down, both vertically and horizontally, on the same scale of a quarter of an inch to a mile.
Would you not admit that both the sections of this division have different degrees of truth, and that the copy is to the original as the sphere of opinion is to the sphere of knowledge?
Several sections of this book and its introduction had appeared in periodical publications, and other parts had been read by Sergey Ivanovitch to persons of his circle, so that the leading ideas of the work could not be completely novel to the public.
In Winesburg, as in all Ohio towns of twenty years ago, there was a section in which lived day laborers.
These three cases of exclusive jurisdiction in the federal government may be exemplified by the following instances: The last clause but one in the eighth section of the first article provides expressly that Congress shall exercise "EXCLUSIVE LEGISLATION" over the district to be appropriated as the seat of government.